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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Balance Sheet [Abstract]          
Unreturned customer inventories $ 21,295 [1]   $ 21,295 [1]   $ 0
Prepaid expenses and other current assets 11,681   11,681   12,300
Accrued customer returns 53,717   53,717   35,916
Accrued core liability 30,002   30,002   11,899
Retained earnings 381,503   381,503   357,153
Statement of Operations [Abstract]          
Net sales [2] 296,619 $ 281,058 845,081 $ 876,165  
Cost of sales 209,313 198,523 603,897 618,854  
Earnings from continuing operations before taxes 26,275 26,643 60,498 82,204  
Provision for income taxes 7,002 9,535 15,801 30,468  
Net earnings 15,749 $ 13,125 39,683 $ 46,623  
ASC 606 [Member]          
Balance Sheet [Abstract]          
Unreturned customer inventories         19,950
Accrued customer returns         42,586
Accrued core liability         26,368
Retained earnings         355,964
Adjustments Due to Adoption of ASU 2014-09 [Member] | ASC 606 [Member]          
Balance Sheet [Abstract]          
Unreturned customer inventories 21,295   21,295   19,950
Prepaid expenses and other current assets (226)   (226)    
Accrued customer returns 7,783   7,783   6,670
Accrued core liability 13,837   13,837   14,469
Retained earnings (551)   (551)   $ (1,189)
Statement of Operations [Abstract]          
Net sales (1,821)   632    
Cost of sales (1,617)   (232)    
Earnings from continuing operations before taxes (204)   864    
Provision for income taxes (49)   226    
Net earnings (155)   638    
Balance Without Adoption of ASU 2014-09 [Member] | ASC 606 [Member]          
Balance Sheet [Abstract]          
Unreturned customer inventories 0   0    
Prepaid expenses and other current assets 11,907   11,907    
Accrued customer returns 45,934   45,934    
Accrued core liability 16,165   16,165    
Retained earnings 382,054   382,054    
Statement of Operations [Abstract]          
Net sales 298,440   844,449    
Cost of sales 210,930   604,129    
Earnings from continuing operations before taxes 26,479   59,634    
Provision for income taxes 7,051   15,575    
Net earnings $ 15,904   $ 39,045    
[1] The adoption of ASU 2014-09 using the modified retrospective method resulted in the recording of unreturned customer inventories commencing on January 1, 2018, see Note 2, "Summary of Significant Accounting Policies" for additional information.
[2] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.